Receiver for wireless telegraphy.



, PATENT'ED AUG. 14, 1906. W. SGHLOEMILCH.

RECEIVER FOR WIEELESE TELEGEAPEY.

I APPLICATION FILED RUIZ-7.1905.

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own 121 par- 85 him? as 301m es beyond a, g

et erious the ie ralav' n onds exami q J -mezuns z cil'suit the Bibi-51omag n-et p are the circuit of the m 1&161 qc a further increase in anno longer C21 Janine Com (1 03211, and 111 this way 5 The V. 7 an Wed (1'50 ate maria onsists 0f .2051 Z herer end all further signals arrivingere trensinitted to the Morse apparatus merely by menus of theelectrolytic detector m; In order to retain the contiict-ermature f inits attract-ed position and so to permanently keep open thecoherer-circnit after it has been 1 once opened, a pawl g is providedwhich is rent dynamo.)

closed earlier by e temporary svvitching on of the transmlttcr-circnit.The armature of the electromegnet r is also connected with e contact itover which the aerial conductor a is connected with the earth. Theobject of this precaution is to prevent the detectors from being excitedby electric currents proceedin from the earth during the transmission.

possibility of being able to easily give electroytie detector m anydesired of sensitiveness sllows oi theermngeinent hereinbeiore describedbeing also employed es an apparatus for recording telegmms which aretrensmitted from its own station. it has ini'ect been found necesser-yinpractice to have a check as to whether the trensinission of the serialconductor is in correct corres aondence with the emitter-circuit that isto say Whether the energy corresponding to the sparks escerteinsble inthe spark-gen is also actually transmitted to the serial conductorsystem. A sure check as regards this can only be carried out withdiliiculty, es the respective interruptions of Working-that is to sey,by the use of e Leyden jer cannot always be easily recognized. Now themust be substsntiell-y less sensitive than the coherer, it is easy torecord this detector the powerful Wave impulses dospctched from theadjscenttrensmitter. For this it is suill eient to arrange at some distancefrom the n]. conductor e second short auxiliary ire which is connectedwith the receiver system insteed of the disconnected serial" con doctora. The telegrnphist is thus in. at position to supervise, from theWorking of the Morse apparatus of the trensini tion,.the correctdelivery of the ale, end.

"to be able to imin edietelyreinove any illipdl merits. At the some timethe srren-gement combines the advantages of Lt recording on perstusproviding a. check over the signals given by the telegrephists. it mayalso he further observed that instead of the filings GOhQvlQl c anyother sensitive coherer ma be senses employed end also, instead of theelectrolytic What I clcirn as my invention, end desire to secure byLetters Petent of the United States, is-

1. In a receiver for Wireless telegraphy, s receivencircuit which setstogether with two detectors of difierent degrees of sensitiveness, andmeans operated by the less sensitive detector for roteotin the moresensitive detector sgelnst too iigh intensities substantially asdescribed. I

2. in a receiver for wireless telegrephy, e receiver-circuit whichcontains two detectors of diiierent do cos of sensitiveness, and meansoperated y the less sensitive detector for disconnecting the moresensitive detector from thereceiver-cincnit substantially es de scribed.

3. In a receiver for Wireless telegre'phy, e receiver-circuit, twodeteotoncircuits electricelly connected with the receiver-circuit, thedetector of one circuit being less sensitive 1 than the detector of theother circuit and means operated by the less sensitive detector fordisconnecting the more sensitive detector from the receiver-circuit,substantially es described.

i. in s receiver for Wireless telegrephy, e receivencircuit, twodetector-circuits electricsll Y connected with the receiver-circuit thedetector oi" the one circuit being less sen- I sitivo then the detectoroi the other circuit, e electrolytic detector, in the presen tinvention,

reley in eech dctectoncircnitsnde recording i apparatus successivelyepersted by both relsys substantiallyes described.

5. in a receiver for Wireless telegrephy, e

' receiver-circuit, two detector-circuits elec trioelly conneetedwiththe receiver-circuit,

the detector of the one circuit being less sensi tive then the detectorof the other circuit, e

relay in each detectoncircuit, a recording epperstus successively oJeroted by both releys and means operated y the lesssensitive detectorfor breaking or opening the circuit

